What is the former sweetheart's motive in "A Wedding Gift"?

The former sweetheart wishes Jacques to be a father to her child.... his child.

It was several minutes before she could speak again, she was so weak. She continued: "The little one is yours. I swear it before God and on my soul. I swear it as I am dying! I have never loved another man but you --promise to take care of the child."